Balanced valve



(No Model.)

B. STEWART.

BALANGED VALVE.

N0. 278,058. Patented May 22,1883.

fz'wenzazw UNITED STATES PATENT OFFICE.

EDWARD STEWART, OF BATTLE CREEK, ASSIGNOR OF ONE-HALF TO RICHARD W. LONSBERY, OF HIGHLAND, MICHIGAN.

BALANCED VALVE.

SPECIFICATION forming part of Letters Patent No. 278,058, dated May 22, 1883.

Application filed January 26,1883. (No model.)

To all whom it may concern:

Be it known "that I, EDWARD STEWART, a

V citizen of the United States, residing at Battle Greek, county of Calhoun, State of Michigan, have invented a new and useful Balance- Valve, of which the following is a specification. I

The object of. my invention consists in an I improved construction to prevent the valve in a steam-chest from becoming set to its seat, and also to prevent an undue friction of said parts, caused by the pressure of the steam on the valve.

A further object is to construct a device for lubricating my improved valve.

In the drawings forming a part of this specification, Figure 1 shows a side elevation of the improved valve located in a steam-chest in section; Fig. 2, a perspectiveview of the valve and its lower hearing or seat, and Fig. 3 a

bearing-surface beneath, owing to the pressure of steam upon said valve.

Bis a plate corresponding in size to the base-plate a of the valve below. Plate B has recesses 12 e in the corners, in which the head of posts r r are located, said posts being secured in plate at below. The recesses e e are made a little deeper than the thickness of the heads of the posts 1" r, to admit of a rise and fall of plate B. The height of the posts r 1,

their heads, and the recesses e e, are so proportioned that there is a little space between plate B and wall y when said plate is at its lowest position Fig. 3. Nuts a may be located on a threaded portion of the posts '1" r, as

illustrated, to regulate the degree of the play of plate B, by turning said nuts up or down, thus providing for the expansion of the metal of which the parts are composed. The plate B is forced against wally by the sudden advent of steam through the ports, and is held in said position by the force and volume of steam between said plate-and the lower valve, a a. When the plate B is in this position the shoulders of the post-heads rest against the lower wall of recesses e 0. Thus the steam exerts as great a pressure on plate B as on plate a, and said pressures, acting against each other, and being limited, and both plates having a bearing-surface during the movement of the valve, said valve is prevented from becoming set, and undue friction of bearing-surfaces of plate a and the ports P P, I provide an oilcup having an upward-extending center tube with a perforation leading into the steamsaid parts is obviated. In order to lubricate both plate B and the seat or bearing-surface of.

chest, and pipes t t, leading from each side into the steam-chest in a position to deposit oil near the mouth of the ports P P, Fig. 1.

Having thus described my invention, what I claim is 1. In a balance-valve, the combination of I ED WARD STEWART.

Witnesses RICHARD W. LONSBERY, J. S. DUER. 

